package org.zjt.netty.client;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.protobuf.ProtobufDecoder;
import io.netty.handler.codec.protobuf.ProtobufEncoder;
import io.netty.handler.codec.protobuf.ProtobufVarint32FrameDecoder;
import io.netty.handler.codec.protobuf.ProtobufVarint32LengthFieldPrepender;
import org.zjt.domain.RpcMsgProto;

/**
 * Created by zhangjuntao on 2017/3/16.
 */
public class NettyClient {

    public ChannelFuture connect(int port, String host) throws Exception {
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            Bootstrap b = new Bootstrap(); // (1)
            b.group(workerGroup); // (2)
            b.channel(NioSocketChannel.class); // (3)
            b.option(ChannelOption.SO_KEEPALIVE, true); // (4)
            b.handler(new ChannelInitializer<SocketChannel>() {
                @Override
                public void initChannel(SocketChannel ch) throws Exception {
                    //添加通道处理
                    ch.pipeline().addLast(new ProtobufVarint32FrameDecoder());   //设置protobuf粘包、拆包的解码器
                    ch.pipeline().addLast(new ProtobufDecoder(RpcMsgProto.msg.getDefaultInstance()));   //protobuf解码器
                    ch.pipeline().addLast(new ProtobufVarint32LengthFieldPrepender());		//设置protobuf粘包、拆包编码器
                    ch.pipeline().addLast(new ProtobufEncoder());							//设置protobuf类的序列化编码器
                    ch.pipeline().addLast(new RpcClientHandler());
                }
            });
            // 启动客户端
            ChannelFuture f = b.connect(host, port).sync(); // (5)

            // 等待连接关闭
            //f.channel().closeFuture().sync();
            return f;
        }catch (Exception e){
           e.printStackTrace();
        }
        return null;
    }

    public void close(EventLoopGroup workerGroup,ChannelFuture f )throws Exception{
        f.channel().closeFuture().sync();
        workerGroup.shutdownGracefully();
    }


    public static void main(String[] args)throws Exception{
        int port = 8070;
        if (args != null && args.length > 0) {
            try {
                port = Integer.valueOf(args[0]);
            } catch (NumberFormatException e) {
                // 采用默认值
            }
        }
        new NettyClient().connect(port, "127.0.0.1");
    }
}




